Abstract

Dust acoustic solitary waves in a dusty plasma containing dust of opposite polarity (adiabatic positive and negative dust), non-isothermal electrons and ions (following vortex like distribution) are theoretically investigated by employing pseudo-potential approach, which is valid for arbitrary amplitude structures. The propagation of small but finite amplitude solitary structures is also examined by using the reductive perturbation method. The basic properties of large (small) amplitude solitary structures are investigated by analyzing the energy integral (modified Korteweg-de Vries equation). It is shown that the effects of dust polarity, trapping of plasma particles (electrons and ions), and temperatures of dust fluids significantly modify the basic features of the dust-acoustic solitary structures that are found to exist in such an opposite polarity dust-plasma medium. The relevance of the work in opposite polarity dust-plasma, which may occur in cometary tails, upper mesosphere, Jupiter's magnetosphere, is briefly discussed.

Received 28 October 2012Accepted 19 February 2013Published online 12 March 2013

Article outline:I. INTRODUCTIONII. GOVERNING EQUATIONS AND LOCALIZED WAVESIII. ARBITRARY AMPLITUDE ELECTROSTATIC SOLITARY WAVESA. When some electrons are trapped and ions are isothermalB. When some ions are trapped and electrons are isothermalC. Small amplitude solitary wavesIV. CONCLUSION